Teleg-raph bepeater



(No Model.) 2 Sheets-Sheet 1.

A. C. BOOTH.

- TELEGRAPH REPEATER.

No. 451,449. r Patented May 5,1891.

EYM MA/ 4 (No Model.) 2 Sheets-Sheet 2. A. 0. BOOTH. TELEGRAPH REPEATER.

w W 1 0 5 5 w y W m fl w m m P 9 .4 r101 W 4 m W UNITED STATES PATENTOFFICE,

ALBERT O. BOOTH, OF CEDAR RAPIDS, IOIVA, ASSIGNOR OF ONE-HALF TOIVILLIAM P. IVARD, OF SAME PLACE.

TELEGRAPH-REPEATER.

SPECIFICATION forming part of Letters Patent No. 451,449, dated May 5,1891.

Application filed August 24, 1889. Renewed March 21, 1891. Serial No.385,847. (No model.)

To all whom it may concern:

Be it known that I, ALBERT O. BOOTH, of Cedar Rapids, in the county ofLinn and State of Iowa, have invented certain new and usefulImprovements in Telegraph-Repeaters, of

which the following is a specification.

The improved repeater is illustrated in the accompanying drawings, inwhich Figure 1 is a diagram showingthe electrical circuits and the modeof operation, and Fig. 2 is a perspective view of the repeatingmechanism.

In the drawings only the instruments at the repeating-station are shown.In the subsequent description, for the sake of clearness and brevity, itwill be considered that a message is to be transmitted from a station tothe right of the repeating-station to a station to the left, though ofcourse messages can be transmitted in either direction. From thetransmitting-station a line-wire 1 leads to a key A at therepeating-station, and the key A is connected by Wire 2 to a fixedmetallic contact or electrode B. A metallic springkey 0 is normally incontact with the electrode B. A wire 3 connects the key O with arelay-magnet D, and the relay-magnet is connected to earth by a wire 4,thus completing the circuit to the transmitting-station, which 0 isequipped with the ordinary Morse instruments. The circuit from thetransmittingstation is normally a closed one. In close proximity to theelectrode B is a second metallic contact or electrodeB which is nor- 3 5mally in metallic contact with a spring-key C The spring-key O isconnected by a wire 5 to a relay-magnet D which is connected to earth bya ground-wire 6. The electrode I3 is connected by a wire 7 to a key Afrom which leads a line-wire 8 to the receivingstation provided with theusual Morse instruments. The circuit through the receivingstation isthus alsonormally a closed one.

E E are the repeating-magnets, and F F are their armatures. Thearmatures F F are mounted on opposite ends of a balanced oscillatinglever G, centrally pivoted in suitable bearings. The lever G is abalanced one, so .that normally both armatures are out of contact withtheir respective magnets. The lever G carries a crank-arm H, of insu- Ris the repeater-battery, one pole of which I is connected by a wire 9with both of the repeatermagnets E E. A normally closed switch I islocated in the wire 9. The opposite pole of the battery is connected bywires 10 and 11, respectively, to the swinging armatures J J 2 of therelay-magnets I) D respectively.

The armatures J J 2 are carried, respectively, by'pivoted metalliclevers K K the armatures and their respective levers being preferablyinsulated from each other. Since the circuits through the relay-magnetsare normally closed, their armatures J J 2 are consequently normallyattracted toward them,

.With the free ends of the levers K K normally in metallic contact withcontacts or electrodes L L respectively. The electrode L is connected bya wire 12 with a soundermagnet M, which is connected by a wire 13 withone pole of a local battery N, the other pole of which is connected by awire 14 with the lever K. The local circuit through the sounder-magnetis thus a normally-closed one.

In a similar manner the electrode L is connected by wire 15 withsounder-magnet M which is connected by wire 16 with one pole of a localbattery N the other pole of. which is connected by wire 17 with thelever K Behind, but out of contact with the levers K K res )ectivel ,aread 'ustable coactin con- 7 l y e tacts 0r electrodes 0 0 which aremounted in metallic brackets P P The bracket P is electrically connectedby wire 18 with the repeaterlnaguet E, and a wire 19 connects therepeater-magnet E with the bracket P It now the circuit is broken at thetransmittingstation, the relay-magnet D will be demagnetized and thearmature .I'will drop back, and its lever K will make electricconnection with the electrode 0. By so doing the circuit through bracketP, wire 18, repeatermagnet E, Wire 9, switch I, repeater-battery R, wire10, lever K, and electrode 0 will be closed, thus exciting the magnet E.The magnet E, being excited, attracts its armature F, thus swinging thebalanced lever G and moving its crank-arm II in the direction of thespring-key 0 thus moving the latter out of contact with the electrode 13This disconnection of the key 0 and electrode B opens the circuitthrough wire 5, relay-magnet D ground-wire 6, the earth, thereceiving-station, line-wire 8, key A and wire 7, thus actuating thereceiving-instrument at the receiving-station. At the same time thefallingback of armatureJ and lever K breaks the local circuit throughthe sounder-magnet M at the repeatin -station. The closing of thecircuit at the transmitting-stations excites magnet D, thus breaking thecircuit through repeater-magnet E, demagnetizing the same, so that thelever G resumesits normal position under the action of the spring-key C,which again touches electrode B and so closes the circuit through thereceiving-station. The excitation of magnet D also closes the localcircuit through the sounder-magnet M. Thus the opening and closing ofthe circuit at the transmitting-station operates asounder at therepeating-station, and by means of the repeater the circuit to thereceivingstation is similarly opened and closed. The transmission of themessage through the receivingstation actuates also the other sounder Mat the repeating-station, since the relay-magnet D is excited anddemagnctized by the opening and closing of the circuit through thereceiving-station. The operator at the repeating-station can thus alwaystell whether or not the repeater is working properly. By means of thekeys AA messages can be transmitted from the repeating-station eitherway. By means of the switch I the circuit through the repeater may bethrown off and the straight circuit used between the repeaterstation andeither of the other stations when the repeater is not to be used. Itwill be observed that each sounder M M will operate independently of therepeater.

I claim as my invention-- 1. Two relay-magnets D D two fixed electrodesB B two spring-keys 0 C coacting, respectively, with said electrodes ata repeating-station, and two normally-closed electric circuits extendingto two distant stations,one of said relay-magnets, electrodes, andspringkeys being located in each of said circuits,in combination withmetallic pivoted levers K K respectively carrying the armatures J J" ofthe said respective relay-magnets D D electrodes 0 O coacting with saidlevers K K respectively, but normally out of contact therewith, arepeater-battery R, wires connecting one pole of said battery with said10- vers K K respectively, repeater-magnets E E connected by wires withsaid electrodes 0 0 respectively, both of said magnets being alsoconnected with the opposite pole of said battery, a balanced swinginglever carrying on opposite ends the armatures of said magnets E E and acrank-arm carried by said lever and located in co-operative relationbetween both of said spring-keys C 0 substantially as set forth.

2. Two relay-magnets D D two fixed electrodes B B two spring-keys 0 Ocoacting, respectively, with said electrodes at a repeating-station, andtwo normally-closed electric circuits extending to two distant stations,one of said relay-magnets, electrodes, and springkeys being located ineach of said circuits, metallic pivoted levers K K, respectivelycarryingthe armatures J J of the said respective relay-magnets D D electrodes 00 co-' acting with said levers K K respectively, but normally out ofcontact therewith, a repeaterbattery R, wires connecting one pole ofsaid battery with said levers K K respectively, repeater-magnets E Econnected by wires with said electrodes 0 0 respectively, both of saidmagnet-s being also connected with the opposite pole of said battery R,a balanccdswingin g lever carrying on opposite ends the armatures ofsaid magnets E E and a crank-arm carried by said lever and located inco-operative relation between both of said spring-keys C 0 incombination with electrodes L L cooperating with said levers K K andarranged to be in contact therewith when the relaymagnets D D areexcited, two local electric circuits, one of said levers K K one of saidelectrodes L U, and one of two sounder-magnets M M being located in eachof said local circuits, respectively, substantially as set forth.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

ALBERT (,1. BOOTH.

Witnesses:

W. 1. Hum, J. C. S'ro'oDAnD.

